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Despite concerns about potential funding cuts from Albany and Washington,...

That’s a mind-blowing $15 billion, or 20 percent, spike from his predecessor’s $74 billion final budget. And it represents spending growth about four times faster than inflation.

City-funded outlays alone this year would rise 4.3 percent (compared to less than 2 percent inflation).

Equally troubling are the risks: a high chance of cuts in state and federal aid; slowing revenue growth; and pricier-than-expected labor settlements. (The mayor, recall, is famously generous to his union pals.)

Plus, Albany is insisting City Hall chip in more for transit costs, starting with nearly half a billion bucks for the MTA’s emergency plan to fix the subways.

Yes, de Blasio can tap city reserves, as he points out. But what happens when his rainy-day monies dry up? And the city would be running with no backup in the meantime.

The biggest problem: The mayor’s outlays will eclipse projected revenue by $1.4 billion — even if the economy chugs along merrily and state and federal aid meets expectations. De Blasio plans to pay the difference next year with money he’s lucky to have left over from this year.

Yet unless the city produces more surprise surpluses, his plan to spend more than he takes in is a recipe for disaster down the line.

Meanwhile, the city’s staffing — already at the highest level since the 1975 fiscal crisis — is pegged to climb even higher, from 331,000 now to 336,000 by 2022.

Ditto for spending on health care, which is slated to rise 7 percent, to $10.7 billion next year — and to $13 billion by 2022.

De Blasio has so far governed in a period of prosperity for New York City, spending freely with no need to face the risks or prepare for leaner times. Thursday’s budget shows no sign he’s ready for that to change.